Spatial distribution of wood volume in Brazilian savannas

Phylogenetic overdispersion of plant species in southern Brazilian savannas.

Ecological communities are the result of not only present ecological processes, such as competition among species and environmental filtering, but also past and continuing evolutionary processes. Based on these assumptions, we may infer mechanisms of contemporary coexistence from the phylogenetic relationships of the species in a community. We studied the phylogenetic structure of plant communi...

Abundance distribution of common and rare plant species of Brazilian savannas along a seasonality gradient

(Abundance distribution of common and rare plant species of Brazilian savannas along a seasonality gradient). We examined the species abundance distribution (SAD) of plant communities in: (1) a wet grassland, waterlogged throughout most of the year; (2) a seasonal savanna, with an annual dry season; and (3) a hyperseasonal savanna, with alternating drought and waterlogging over the year. We sea...

Spatial distribution of earthworms in natural and disturbed savannas of the Eastern plains of Colombia

Spatial distribution of earthworms in acid-soil savannas of the eastern plains of Colombia

The horizontal spatial distribution of earthworms in a native savanna and in a 17 year introduced pasture from the area of Carimagua (Colombia) was assessed by means of aggregation indices and geostatistical analysis. Morisita’s index (Id) and Taylor’s index (b) were calculated from field data obtained through 1 m2 quadrats during a sampling period of 17 months and both semivariograms and conto...

Diversity of Tropical Spiders - Ground-dwelling Species of Brazilian Savannas

Spiders are one of the biggest and most diverse groups of arthropods. There are around 40000 described species of spiders, belonging to more than 100 families and 3600 genera. However, 170000 species of these arachnids are estimated to exist in the world, which reflects the scantiness of studies about this group. The distribution and diversity of spiders in macro and micro-scale in the tropics ...